German artist Kim Köster (Kim Kwacz) paints colorful monsters in abandoned buildings, but not just for the sake of street art. While monsters are typically scary, Kim’s variants are quite adorable at times, enough to be appreciated by children.

Starting off spray painting mischievous creatures in random old warehouses outside the city of Berlin, his monsters interacted with the surroundings. Now, these creatures interact via an e-book available to iPad users, aptly called “Monzter.” The interactive children’s picture book allows users to play with the creatures without the need to travel to Germany or to explore creepy abandoned locations.

The secret creatures Kim painted vary in size and color, and even personalities! Some appear to be quite freaky and a bit sinister, but others are less monster-like with seemingly shy or playful dispositions. The app version allows kids to laugh about these creatures while possibly exploring thoughts like “Are ghosts able to see me?” and “How big is the sun?”

Here’s a behind the scenes clip you might want to check out as well:

Here are some of the original street art pieces the artist has made:

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For more info about the iPad app, view the Monzter web page, or like them on Facebook.